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ADM1031
1
9
1
9
SCL
SDA
0
1
0
1
1
A1
A0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADM1031
FRAME 2
ADDRESS POINTER REGISTER BYTE
ACK. BY
ADM1031
STOP BY
MASTER
Figure 16. Writing to the Address Pointer Register Only
1
9
1
9
SCL
SDA
0
1
0
1
1
A1
A0
R/W
D7
D6
D5
D4
D3
D2
D1
D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
ADM1031
FRAME 2
DATA BYTE FROM ADM1031
NO ACK.
BY MASTER
STOP BY
MASTER
Figure 17. Reading Data from a Previously Selected Register
Alert Response Address
Alert Response Address (ARA) is a feature of SMBus
devices that allows an interrupting device to identify itself
to the h ost when multiple devices exist on the same bus.
The INT output can be used as an interrupt output or can
be used as an SMBALERT. One or more INT outputs can be
connected to a common SMBALERT line connected to the
master. If a device’s INT line goes low, the following
procedure occurs:
1. SMBALERT is pulled low.
2. Master initiates a read operation and sends the
Alert Response Address (ARA = 0001 100). This
is a general call address that must not be used as a
specific device address.
3. The device whose INT output is low responds to
the alert response address, and the master reads its
device address. The address of the device is now
External Measurement
The ADM1031 can measure the temperatures of two
external diode sensors or diode-connected transistors,
connected to Pins 9 and 10, and Pins 11 and 12.
These pins are dedicated temperature input channels. The
function of Pin 7 is as a THERM input/output and is used to
flag overtemperature conditions.
The forward voltage of a diode or diode-connected
transistor, operated at a constant current, exhibits a negative
temperature coefficient of about –2 mV/ ? C. Unfortunately,
the absolute value of V BE , varies from device to device, and
individual calibration is required to null this out. As a result,
the technique is unsuitable for mass production.
The technique used in the ADM1031 is to measure the
change in V BE when the device is operated at two different
currents.
This is given by:
known and can be interrogated in the usual way.
4. If more than one device’s INT output is low, the
one with the lowest device address has priority, in
accordance with normal SMBus arbitration.
5. Once the ADM1031 has responded to the alert
response address, it resets its INT output.
However, if the error condition that caused the
D V BE + KT q ln(N)
where:
K is Boltzmann’s constant
q is charge on the carrier
T is absolute temperature in Kelvins
N is ratio of the two currents
(eq. 1)
interrupt persists, then INT is reasserted on the
next monitoring cycle.
Temperature Measurement System
Internal Measurement
The ADM1031 contains an on-chip bandgap temperature
sensor. The on-chip ADC performs conversions on the
Figure 18 shows the input signal conditioning used to
measure the output of an external temperature sensor. This
figure shows the external sensor as a substrate transistor,
provided for temperature monitoring on some
microprocessors, but it could equally well be a discrete
transistor.
output of this sensor and outputs the temperature data in
10-bit twos complement format. The resolution of the local
temperature sensor is 0.25 ? C. The format of the temperature
data is shown in Table 6.
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